Date   

Re: IDE Channels

a_van_belle
 

--- In MSG-1@yahoogroups.com, "Alan Sewards" <alan.sewards@c...>
wrote:
Hi folks,
Does anyone know if the two IDE channels are independent? That
is, can
writing to disks be done simultaneously on both channels, and can
one
channel be reading while the other is writing? I ask this because
it has
implications for single machine MSG-1 systems. I went to some
trouble to set
mine up so that drive C: was on controller IDE 0 and drive D: on
IDE1, drive
C: has the programs on it and the system, and drive D: all the MSG-
1 stuff
including raw data and images. I don't know if it has helped or
not, but now
I have a good reason for wanting to put both C: and D: on one
controller and
wonder if I will lose performance as a result.
Best regards - Alan
Hello Alan,

Theoretically using two separate IDE channels will give better
performance.
But because the mechanics in your drive aren't up to handling data
that fast, in practice you won't see the difference.
For example, UDMA133 can handle up to 133 Mb/s, but a fast disk won't
get close to the 45 Mb/s random read. So on a single channel there is
enough "bandwidth" to handle two disks "simultaneously".
But be warned, speed can drop drastically if you place a fast disk
and an older disk (UDMA66 or 33) on the same channel. The channel is
then fixed to the lower speed !
The same applies if you place a non-UDMA CDROM/Writer on the same
channel together with a fast disk.

Only on high performance RAID (RAID0 or stripe) two hardware channels
give better performance. In RAID0 the controller splits data in two
portions and writes simultaneously on both disks. When reading data
it reads the "even" part from disk1 and simultaneously the "odd" part
from disk2 giving a 100 % performance increase.
Placing 2 disks of 40 GB in RAID0 will give one virtual 80 GB disk.
Disadvantage is you need a capable dual channel controller and if one
disk fails, the data on the other disk is useless.

A very good freeware tool to test disk throughput is Aida32. But
never use the write test as it will overwrite all data !
http://www.aida32.hu/aida32.php

Greetings,
Arne van Belle


Re: snow images

ltn_wx
 

It's important to point out that I'm a complete rookie wrg to MSG
imagery interpretation. Nevertheless, Robert was kind enough to
forward me a jpg which I've been pouring over for some while.

Comparing Robert's excellent image with accurate terrain maps my
humble opinion is that the features to which he refers are mainly
topographical.

Noting the time of capture, could some of the features be shadow
from medium/higher level cloud?

As a complete novice, I look forward to being "put straight" by the
experts :)


Re: IDE Channels

David J Taylor GM8ARV 🏴󠁧󠁢󠁳󠁣󠁴󠁿 🇪🇺
 

--- In MSG-1@yahoogroups.com, "Alan Sewards" <alan.sewards@c...>
wrote:
Hi folks,
Does anyone know if the two IDE channels are independent? That
is, can writing to disks be done simultaneously on both channels,
and can one channel be reading while the other is writing?

Alan, I wish I could be sure, but something at the back of my mind
says no. Possibly, two control operations can take place at the
same time, but not two data transfers. I recall there is only one
DMA channel, but two IRQs (do I recall correctly?).

The situation is a little complex on the single PC system. The
tellique software needs to assemble segment files from the DVB
stream, and write those files to disk. Asynchronously, the MSG Data
Manager will read the Tellique files from disk (or the cache?), and
write data to memory (except for the raw I/O case where data is
written to disk). At the end of the scan for each channel, the data
in memory will be written to disk.

So I guess the raw segments should be kept on a separate drive and
channel for optimum performance. But what are you really trying to
achieve? I would guess zero missing segments. Therefore the system
should be optimised for the Tellique software and everything else
picks up what is left.

Oh, and all of the above assumes suffcient physical memory that
paging does not occur.

Just my ramblings - I'd welcome thoughts from others...

Cheers,
David


Re: IDE Channels

Guy Martin <agm@...>
 

Alan,

That's something I've never been asked. Looking in the book at a Gigabyte GA-7NNXP motherboard. This board has 4 ide connectors and can be used as a Raid 0/1 if you wish. The book says ' Supports concurrent dual ATA 133 IDE controller operation.'

Looking at a non-raid m/b there is no mention of this and I would probably think that the answer is no in that case, the controller switches addresses to the device it wants to talk to, but I'm willing to be proven wrong.

Cheers, Guy

----- Original Message -----
From: Alan Sewards
To: MSG-1@yahoogroups.com
Sent: Thursday, January 29, 2004 4:29 PM
Subject: [MSG-1] IDE Channels


Hi folks,
Does anyone know if the two IDE channels are independent? That is, can
writing to disks be done simultaneously on both channels, and can one
channel be reading while the other is writing?
----------

http://www.gordano.com - Messaging for educators.


Re: Meteosat 8 - Meteosat 7 co-channel interference

David J Taylor GM8ARV 🏴󠁧󠁢󠁳󠁣󠁴󠁿 🇪🇺
 

--- In MSG-1@yahoogroups.com, "Alan Sewards" <alan.sewards@c...>
wrote:
[]
Re missed segments on 28/1/04, I had the same ones missing at
1930, 1945, and also had 2215, ch 12 segment 1 missing. Could have
been wind, as it was strong last night.

Alan, for what it's worth, my report was:

Missing HRIT & LRIT segments report
Cycle: 1845 HRIT ch 4 seg 2 (only on one PC)
Cycle: 1930 HRIT ch 8 seg 5 (on two PCs)
Cycle: 1945 HRIT ch 4 seg 3 (on two PCs)
Cycle: 1945 LRIT ch 9 seg 3 (on two PCs)

The last three segments wer emissing on two PCs, and were also
reported by Eumetsat, so perhaps there were problems with the
uplink. I run the Setup4PC program continuously, and no uncorrected
blocks were reported.

Thanks for the comments on interference - it was suppose to be one
of the potential problems, and I was just interested to know if was
no longer a problem in practice, as it should no longer be a problem
in theory!

Cheers,
David


Re: Meteosat 8 - Meteosat 7 co-channel interference

Alan Sewards <alan.sewards@...>
 

Folks,
As the SSPA slated to provide the power for the MSG-1 user downlink on
1691 MHz or so is defunct, it seems most unlikely that MSG-1 is radiating
anything that might interfere with Met 7 WEFAX. There will be lots of other
signals being radiated from the satellite such as raw data and continuous
telemetry, but these are likely to be in other frequency bands. In any
event, the Eumetsat ground station will have a large enough antenna to
ensure that it can only see one satellite at a time. The Ku band TV dishes
we have been using for the MSG-1 trials are irrelevant, as they are looking
at Hotbird and not MSG-1. FYI, the 3 dB beamwidth of an 88 cm dish is about
2 degrees.

Re missed segments on 28/1/04, I had the same ones missing at 1930,
1945, and also had 2215, ch 12 segment 1 missing. Could have been wind, as
it was strong last night.

Best regards - Alan

----- Original Message -----
From: "Peter Benney" <tugboat@gotadsl.co.uk>
To: <MSG-1@yahoogroups.com>
Sent: Thursday, January 29, 2004 10:27 AM
Subject: [MSG-1] Meteosat 8 - Meteosat 7 co-channel interference



So with Meteosat-8 at its operational 3.4W position (according to
very recent Kepler data), is anyone seeing co-channel interference
between the two satellites, or does that possibility no longer exist
now that there is no direct dissemination? What about ranging?
D avid,

I am receiving Met 7 Wefax using a RIG yagi with no interference.

http://www.polarorbiter.co.uk/D2.htm

BTW: I missed a few segments last night - don't know why.
Missed the following 28/1/04
1930
Ch 8 Seg 5
1945
Ch 4 Seg 3
lrit Ch 9 Seg 3







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IDE Channels

Alan Sewards <alan.sewards@...>
 

Hi folks,
Does anyone know if the two IDE channels are independent? That is, can
writing to disks be done simultaneously on both channels, and can one
channel be reading while the other is writing? I ask this because it has
implications for single machine MSG-1 systems. I went to some trouble to set
mine up so that drive C: was on controller IDE 0 and drive D: on IDE1, drive
C: has the programs on it and the system, and drive D: all the MSG-1 stuff
including raw data and images. I don't know if it has helped or not, but now
I have a good reason for wanting to put both C: and D: on one controller and
wonder if I will lose performance as a result.
Best regards - Alan

Alan Sewards
email: alan.sewards@computer.org
web site: http://asewards.free.fr


Re: EKU

Mark Broddin
 

Pat,

According to Mr. Marc Christiaens, licensing officer of Eumetsat in
Brussels, the paperwork will be send to trial users next week.

Regards and groeten

Mark Broddin
2531 Boechout
Belgium

----- Original Message -----
From: "on4aao" <pat.on4aao@village.uunet.be>
To: <MSG-1@yahoogroups.com>
Sent: Wednesday, January 28, 2004 10:33 PM
Subject: [MSG-1] EKU



Has someone had any experience yet in obtaining the license
from the belgium met office ? Who/where to send the request.
Tnx

Pat, on4aao






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snow images

Robert Moore
 

David loaded a very nice image of parts of the UK under snow. I was just looking
at my own 1530 HRV image today and noticed some lines in the snow, for example
at 51.8N 1.3W and elsewhere. I suppose some might be rivers where the snow has
melted (or not settled) in the zone around the relatively warm water. But
others seem to be very much in the position of motorways .... surely not?
Puzzled.

Robert





Robert Moore

tel and fax: 44 (0) 1352 714456


Re: Payment

Guy Martin <agm@...>
 

Same here,

Guy

----- Original Message -----
From: ltn_wx
To: MSG-1@yahoogroups.com
Sent: Thursday, January 29, 2004 3:01 PM
Subject: [MSG-1] Re: Payment


I can confirm that the credit card payment facility is now in place,
having just done it effortlessly over the phone.



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Re: Payment

ltn_wx
 

I can confirm that the credit card payment facility is now in place,
having just done it effortlessly over the phone.


Re: EKU

Luca Bertagnolio <lucaberta@...>
 

Pat,

--- In MSG-1@yahoogroups.com, "on4aao" <pat.on4aao@v...> wrote:
Has someone had any experience yet in obtaining the license
from the belgium met office ? Who/where to send the request.
I have tried sending an email to a couple of contacts at IRM-KMI, but
no reply. I then printed that same email and sent it via fax to the
same people, but still got no reply. This all happened in the last
two weeks.

So far no signs of life from Mr. Marc Christiaens...

More info at:
http://www.meteo.be/IRM-KMI/francais/index.php?doc=Afdeling2FR
http://www.meteo.be/IRM-KMI/nederlands/index.php?doc=Afdeling2

Best regards,

Luca Bertagnolio IK2OVV - ON4OVV
Brussels, Belgium


Snow covers the UK - the view from Meteosat-8

David J Taylor GM8ARV 🏴󠁧󠁢󠁳󠁣󠁴󠁿 🇪🇺
 

Here is an image from today using Meteosat-8's High-Resolution
Visible channel and 10.8um thermal channel:

http://www.david-taylor.myby.co.uk/software/msg_dm.htm#sample

It was processed by GeoSatSignal into a polar stereographic
projection.

Cheers,
David
--
Quality software written to your requirements
Web: http://www.satsignal.net
Email: davidtaylor@writeme.com


Re: OT - new rx computer

Hugh Marnoch
 

One of the hazards of living in the Highlands, or Mars as Dabs like to
think of it ;-)

--- In MSG-1@yahoogroups.com, "Guy Martin" <agm@t...> wrote:
Most we got charged was £8 and that included an atx midi case,
usually about
£5

Guy

----- Original Message -----
From: "Hugh Marnoch" <hugh@m...>
To: <MSG-1@yahoogroups.com>
Sent: Thursday, January 29, 2004 11:27 AM
Subject: [MSG-1] Re: OT - new rx computer


Dishes

Douglas Deans <douglas@...>
 

Just to confirm what Ian has already mentioned in the SatSignal group.
I have been using an 80cms mesh dish for MSG (and previously ATOVS) without
any problems.
It is an ex-SKY analogue dish (Scotland needed 80cms for analogue), dark
grey....perfect.

Regards
Douglas.


Re: OT - new rx computer

Guy Martin <agm@...>
 

Most we got charged was �8 and that included an atx midi case, usually about
�5

Guy

----- Original Message -----
From: "Hugh Marnoch" <hugh@marnoch.org>
To: <MSG-1@yahoogroups.com>
Sent: Thursday, January 29, 2004 11:27 AM
Subject: [MSG-1] Re: OT - new rx computer


Also recommend Ebuyer, prices are good, delivery is swift and cheap,

Dabs are good also but the gits want �25 to deliver anything to me.

*********** REPLY SEPARATOR ***********
Message: 4
Date: Wed, 28 Jan 2004 11:17:42 EST
From: basilhaigh@aol.com
Subject: Re: OT - new rx computer


Hi Lawrence,

www.ebuyer.com are competitive. I have dealt with them in the past for
Mobo
and CPU's.

Regards,

Basil Haigh Pritchard






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Re: OT - new rx computer

Hugh Marnoch
 

Also recommend Ebuyer, prices are good, delivery is swift and cheap,

Dabs are good also but the gits want 25 to deliver anything to me.

*********** REPLY SEPARATOR ***********

Message: 4
Date: Wed, 28 Jan 2004 11:17:42 EST
From: basilhaigh@aol.com
Subject: Re: OT - new rx computer


Hi Lawrence,

www.ebuyer.com are competitive. I have dealt with them in the past for
Mobo
and CPU's.

Regards,

Basil Haigh Pritchard



Re: Meteosat 8 - Meteosat 7 co-channel interference

Lawrence Brown <lawrie@...>
 

Hi David

No problems with Meteosat 7 channels 1&2
Timestep System with 90cm dish.

Cheers Lawrence Brown
lawrie@g4wsn.freeserve.co.uk

----- Original Message -----
From: "David Taylor" <david-taylor@blueyonder.co.uk>
To: <MSG-1@yahoogroups.com>
Sent: Thursday, January 29, 2004 9:03 AM
Subject: [MSG-1] Meteosat 8 - Meteosat 7 co-channel interference


So with Meteosat-8 at its operational 3.4W position (according to
very recent Kepler data), is anyone seeing co-channel interference
between the two satellites, or does that possibility no longer exist
now that there is no direct dissemination? What about ranging?

BTW: I missed a few segments last night - don't know why.

Cheers,
David




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Re: Meteosat 8 - Meteosat 7 co-channel interference

Guy Martin <agm@...>
 

Assuming Met 8 and Met 7 operate on the same raw data downlink frequ, Eumetsat's dishes are obviously large enough to have a beamwidth of less than 3.4deg.
The raw data downlink for Met 7 is I believe on 1697Mhz and Ch1 & 2 on 1691 & 1694.5, so no co-channel there .

Cheers Guy

----- Original Message -----
From: David Taylor
To: MSG-1@yahoogroups.com
Sent: Thursday, January 29, 2004 9:03 AM
Subject: [MSG-1] Meteosat 8 - Meteosat 7 co-channel interference


So with Meteosat-8 at its operational 3.4W position (according to
very recent Kepler data), is anyone seeing co-channel interference
between the two satellites, or does that possibility no longer exist
now that there is no direct dissemination? What about ranging?

BTW: I missed a few segments last night - don't know why.

Cheers,
David



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Meteosat 8 - Meteosat 7 co-channel interference

Peter Benney <tugboat@...>
 

So with Meteosat-8 at its operational 3.4W position (according to
very recent Kepler data), is anyone seeing co-channel interference
between the two satellites, or does that possibility no longer exist
now that there is no direct dissemination? What about ranging?
D avid,

I am receiving Met 7 Wefax using a RIG yagi with no interference.

http://www.polarorbiter.co.uk/D2.htm

BTW: I missed a few segments last night - don't know why.
Missed the following 28/1/04
1930
Ch 8 Seg 5
1945
Ch 4 Seg 3
lrit Ch 9 Seg 3